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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
All 5.0's are 4.9's. a real 5.0 is a 305 cubic inch motor, mustangs are only 302 cubic inches, making them a 4.9. But Ford thought 4.9 would sound kinda funny, as well as look dumb on the side of a car so they called em 5.0's
Well if it makes everyone feel better when you bore your 301.9 CID Stang engine .030", as most people do during a rebuild, itdisplaces 306.4 CID or 5.0209964096 liters.